HLSL: Added support for tessellation

Author: xen2

spirv_cross.cpp

@@ -4500,6 +4500,8 @@ void Compiler::ActiveBuiltinHandler::handle_builtin(const SPIRType &type, BuiltI
 	}
 	else if (builtin == BuiltInPosition)
 	{
+		if (type.storage == StorageClassInput && type.array_size_literal[0])
+			compiler.position_input_count = type.array[0];
 		if (decoration_flags.get(DecorationInvariant))
 			compiler.position_invariant = true;
 	}

spirv_cross.hpp

@@ -957,6 +957,7 @@ class Compiler
 	uint32_t clip_distance_count = 0;
 	uint32_t cull_distance_count = 0;
 	bool position_invariant = false;
+	int position_input_count = 0;
 
 	void analyze_parameter_preservation(
 	    SPIRFunction &entry, const CFG &cfg,

spirv_glsl.hpp

@@ -412,7 +412,7 @@ class CompilerGLSL : public Compiler
 		uint32_t src_id;
 	};
 	TemporaryCopy handle_instruction_precision(const Instruction &instr);
-	void emit_block_instructions(SPIRBlock &block);
+	virtual void emit_block_instructions(SPIRBlock &block);
 	void emit_block_instructions_with_masked_debug(SPIRBlock &block);
 
 	// For relax_nan_checks.